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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2020 Nordix Foundation.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.xacml.pdp.application.nativ;
import com.att.research.xacml.api.Request;
import com.att.research.xacml.api.Response;
import com.att.research.xacml.util.XACMLPolicyScanner;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.Map;
import org.apache.commons.collections4.MapUtils;
import org.onap.policy.models.decisions.concepts.DecisionRequest;
import org.onap.policy.models.decisions.concepts.DecisionResponse;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.onap.policy.pdp.xacml.application.common.ToscaPolicyConversionException;
import org.onap.policy.pdp.xacml.application.common.ToscaPolicyTranslator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class implements one translator that interprets TOSCA policy and decision API request/response payload.
*
* @author Chenfei Gao (cgao@research.att.com)
*
*/
public class NativePdpApplicationTranslator implements ToscaPolicyTranslator {
private static final Logger LOGGER = LoggerFactory.getLogger(NativePdpApplicationTranslator.class);
private static final String POLICY = "policy";
public NativePdpApplicationTranslator() {
super();
}
@Override
public Object convertPolicy(ToscaPolicy toscaPolicy) throws ToscaPolicyConversionException {
//
// Extract the Base64 encoded policy xml string and decode it
//
String encodedXacmlPolicy = getNativeXacmlPolicy(toscaPolicy);
String decodedXacmlPolicy;
try {
decodedXacmlPolicy = new String(Base64.getDecoder().decode(encodedXacmlPolicy), StandardCharsets.UTF_8);
} catch (IllegalArgumentException exc) {
throw new ToscaPolicyConversionException("error on Base64 decoding the native policy", exc);
}
LOGGER.debug("Decoded xacml policy {}", decodedXacmlPolicy);
//
// Scan the string and convert to xacml PolicyType
//
try (ByteArrayInputStream is = new ByteArrayInputStream(decodedXacmlPolicy.getBytes(StandardCharsets.UTF_8))) {
//
// Read the Policy In
//
Object policy = XACMLPolicyScanner.readPolicy(is);
if (policy == null) {
throw new ToscaPolicyConversionException("Invalid XACML Policy");
}
return policy;
} catch (IOException exc) {
throw new ToscaPolicyConversionException("Failed to read policy", exc);
}
}
private String getNativeXacmlPolicy(ToscaPolicy toscaPolicy) throws ToscaPolicyConversionException {
Map<String, Object> propertyMap = toscaPolicy.getProperties();
if (MapUtils.isEmpty(propertyMap) || !propertyMap.containsKey(POLICY)) {
throw new ToscaPolicyConversionException("no xacml native policy found in the tosca policy");
}
String nativePolicyString = propertyMap.get(POLICY).toString();
LOGGER.debug("Base64 encoded native xacml policy {}", nativePolicyString);
return nativePolicyString;
}
@Override
public Request convertRequest(DecisionRequest request) throws ToscaPolicyConversionException {
throw new ToscaPolicyConversionException("Do not call native convertRequest");
}
@Override
public DecisionResponse convertResponse(Response xacmlResponse) {
//
// We do nothing to DecisionResponse for native xacml application
//
return null;
}
}
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